EQUITY (Common Stock) (Details) - USD ($)		3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Feb. 29, 2020	Dec. 31, 2019	Feb. 28, 2019
Class of Stock [Line Items]
Stock repurchased		$ 10,449,000
Proceeds from sale of shares	$ 383,800,000
Fees related to stock issuance	$ 700,000
Increase (Decrease) in Stockholders' Equity
Balance (in shares)			115,243,029
Issuance of stock (in shares)			127,330,160
Stock option exercises (in shares)			3,599,504
Vesting of restricted stock awards, net of shares withheld for tax (shares)			2,586,232
Balance (in shares)			250,135,347
AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)			1,376,422
Class A common stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.01			$ 0.01
Authorized amount					$ 150,000,000		$ 150,000,000
Stock repurchased (shares)				400,000
Stock repurchased				$ 10,400,000
Increase (Decrease) in Stockholders' Equity
Balance (in shares)			115,242,028
Issuance of stock (in shares)			12,130,540
Stock option exercises (in shares)			3,599,504
Vesting of restricted stock awards, net of shares withheld for tax (shares)			2,586,232
Balance (in shares)			135,335,943
Common stock, shares authorized (in shares)			1,500,000,000			1,500,000,000
Class A common stock | AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)			1,777,639
Class A common stock | Underwritten
Class of Stock [Line Items]
Number of shares sold (in shares)	12,130,540
Class B common stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.01			$ 0.01
Increase (Decrease) in Stockholders' Equity
Balance (in shares)			1,000
Issuance of stock (in shares)			0
Stock option exercises (in shares)			0
Vesting of restricted stock awards, net of shares withheld for tax (shares)			0
Balance (in shares)			1,000
Common stock, shares authorized (in shares)			1,000			1,000
Class B common stock | AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)			0
Class C common stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.01			$ 0.01
Number of shares sold (in shares)			115,199,620
Increase (Decrease) in Stockholders' Equity
Balance (in shares)			1
Issuance of stock (in shares)			115,199,620
Stock option exercises (in shares)			0
Vesting of restricted stock awards, net of shares withheld for tax (shares)			0
Balance (in shares)			114,798,404
Common stock, shares authorized (in shares)			499,999,000			499,999,000
Class C common stock | AOG
Increase (Decrease) in Stockholders' Equity
Exchanges of AOG Units (in shares)			(401,217)
Common Stock
Increase (Decrease) in Stockholders' Equity
Common stock, shares authorized (in shares)			500,000,000			500,000,000